PDK-1/Akt signaling inhibitors

ABSTRACT

Use of a new class of phosphoinositide-dependent kinase-1 (PDK-1) inhibitors of formula I for inducing apoptosis in unwanted rapidly proliferating cells, for treating, inhibiting, or delaying the onset of cancer, and for preventing restenosis in a subject that has undergone an angioplasty or stent: 
                         
wherein X is selected from the group consisting of alkyl and haloalkyl; Ar is an aryl radical selected from the group consisting of phenyl, biphenyl, naphthyl, anthryl, phenanthryl, and fluorenyl; and wherein Ar is optionally substituted with one or more radicals selected from the group consisting of halo, C 1 -C 4  alkyl, C 1 -C 4  haloalkyl, azido, C 1 -C 4  azidoalkyl, aryl, akylaryl, haloaryl, haloalkylaryl, and combinations thereof; and R is selected from the group consisting of nitrile, acetonitrile, ethylnitrile, propylnitrile, carboxamide, amidine, tetrazole, oxime, hydrazone, acetamidine, aminoacetamide, guanidine, and urea.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 11/864,612, filed Sep. 28, 2007, which is a continuation of U.S. patent application Ser. No. 10/957,925, filed Oct. 4, 2004. The disclosures of both applications are incorporated herein by reference in their entirety. In addition, this application claims priority to U.S. Provisional Patent Application No. 60/508,619 filed Oct. 3, 2003, the disclosure of which is incorporated herein by reference in its entirety, and U.S. Provisional Patent Application No. 60/509,814 filed Oct. 8, 2003, the disclosure of which is incorporated herein by reference in its entirety.

STATEMENT REGARDING FEDERALLY FUNDED RESEARCH

This invention was made, at least in part, with government support under National Institutes of Health Grant CA94829 and Army Grant DAMD 17-02-1-0117. The government may have certain rights in this invention.

BACKGROUND OF THE INVENTION

The phosphoinositide (PI) 3-kinase/PDK-1/Akt signaling cascade represents a convergence point for a plethora of receptor tyrosine kinase and cytokine-mediated pathways that regulate cell proliferation and survival, and offers a framework to account for the ability of many extracellular trophic factors to maintain cell survival. Dysregulation of this signaling cascade due to constitutive growth factor-receptor activation and/or PTEN imitations results in Akt up-regulation, which subsequently, promotes tumor invasiveness, angiogenesis, and progression. Thus, PDK-1/Akt signaling inhibitors are of translational relevance for development into useful chemotherapeutic or chemopreventive agents. There exists a need for development of new compounds that are potent PDK-1/Akt signaling inhibitors. There further exists a need for the development of chemotherapeutic agents and chemopreventative agents based on PDK-1/Akt signaling inhibition.

SUMMARY OF THE INVENTION

Provided are methods of inducing apoptosis in unwanted rapidly proliferating cells, methods for treating, inhibiting, or delaying the onset of cancer, and methods for preventing restenosis in a subject that has undergone an angioplasty or stent, said methods comprising the step of contacting or administering a therapeutically effective amount of a compound of formula I:

wherein

-   X is selected from the group consisting of alkyl and haloalkyl; -   Ar is selected from the group consisting of phenyl, biphenyl,     naphthyl, anthryl, phenanthrenyl, and fluorenyl; wherein Ar is     optionally substituted with one or more substituents at any suitable     position; -   R is selected from the group consisting of —CN, —CH₂CN, —CH₂CH₂CN,     —CH₂CH₂CH₂CN,

or metabolites or pharmaceutically acceptable salts thereof.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows dose-dependent effects of compounds 70 (left panels) and 71 (right panels) on cell viability of PC-3 cells and on the cell growth in nine representative human tumor cell lines.

FIG. 2 shows the synthesis of compounds 37-72 using the 1,1,1-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one as a common precursor.

DETAILED DESCRIPTION OF THE INVENTION

Provided is a new class of PDK-1/Akt signaling inhibitors. The compounds described herein are useful for inducing apoptosis in undesirable proliferating cells, such as cancer cells. The compounds described herein are also useful in promoting wound healing and preventing scarring. The compounds described herein further have application in preventing restenosis. The compounds described herein further have application in organ transplantation.

The compounds described herein can be shown in the general formula I:

wherein X is selected from alkyl and haloalkyl; Ar is selected from the group consisting of phenyl, biphenyl, naphthyl, anthryl, phenanthryl, and fluorenyl; R is selected from the group consisting of —CN, —CH₂CN, —CH₂CH₂CN, —CH₂CH₂CH₂CN—CONH₂

Stated otherwise, R is selected from nitrile, acetonitrile, ethylnitrile, propylnitrile, carboxyamide, amidine, pyrazole, oxime, hydrazone, acetamidine, acetamide, guanidine, and urea. Formula I also includes pharmaceutically acceptable salts thereof, metabolism products, and prodrugs thereof.

In some embodiments, X is C₁ to C₄ haloalkyl. In some embodiments, X is CF₃. In some embodiments, Ar may be substituted at any substitutable position with one or more radicals, such as, but not limited to halo, C₁-C₄ alkyl, C₁-C₄ haloalkyl, azido, C₁-C₄ azidoalkyl, aryl, akylaryl, haloaryl, haloalkylaryl, and combinations thereof In some embodiments, Ar is selected from 2-naphthyl, 4-biphenyl, 9-anthryl, 2-fluorenyl, 4-azidophenyl, 4-azidomethylphenyl, 4-(2-azidoethyl)phenyl, 4-(3-azidopropyl)phenyl, 4-(4-azidobutyl)phenyl, 4-(4-azidophenyl)phenyl, 4-(4-azidomethylphenyl)phenyl, 4-methylphenyl, 4-ethylphenyl, 4-propylphenyl, 4-butylphenyl, 4-(2-bromoethyl)phenyl, 4-(3-bromopropyl)phenyl, 4-(4-bromobutyl)phenyl, 4-(trifluoromethyl)phenyl, 4-(4-methylphenyl)phenyl, 4-(4-bromomethylphenyl)phenyl, 4-(4-butylphenyl)phenyl, 4-(4-tert-butylphenyl)phenyl, 2-chlorophenyl, 4-chlorophenyl, 2,4-dichlorophenyl, 3,4-dichlorophenyl, 2,5-dichlorophenyl, 2,4-dimethylphenyl, 2,5-dimethylphenyl, 3,4-dimethylphenyl, 3,5-dimethylphenyl, 4-(4-chlorophenyl)phenyl, 4-(3,5-dichlorophenyl)phenyl, 4-(2,3-dichlorophenyl)phenyl, 4-(3,5-dimethylphenyl)phenyl, 4-(2,4,5-trichlorophenyl)phenyl, 4-(4-trifluoromethylphenyl)phenyl, 2-phenanthrenyl, 3-indolyl, 2-pyrrolyl, and 4-(benzyl)phenyl. In some embodiments, Ar is selected from 4-(2-bromoethyl)phenyl, 4-(3-bromopropyl)phenyl, 4-(2-azidoethyl)phenyl; 4-(3-azidopropyl)phenyl, 4-butylphenyl, 4-t-butylphenyl, 2-naphthalenyl, 3-indolyl, 4-biphenylyl, 4′-chloro[1,1′-biphenyl]-4-yl, 3′,5′-dichloro[1,1′-biphenyl]-4-yl, 2′,3′-dichloro[1,1′-biphenyl]-4-yl, 4′-methyl[1,1′-biphenyl]-4-yl, 4′-trifluoromethyl[1,1′-biphenyl]-4-yl, 4′-bromomethyl[1,1′-biphenyl]-4-yl, 3′,5′-dimethyl[1,1′-biphenyl]-4-yl, 4′-butyl[1,1′-biphenyl]-4-yl, 4′-tert-butyl[1,1′-biphenyl]-4-yl, 4-(phenylmethyl)phenyl, 9H-fluoren-2-yl, 9-anthracenyl, 2-phenanthrenyl, 9-phenanthrenyl. In some embodiments, Ar is 2-phenanthrenyl. In some embodiments, R is selected from aminoacetamide and guanidine.

Another embodiment described herein is that of formula II:

wherein X is selected from alkyl and haloalkyl; R is selected —CN, —CH₂CN, —CH₂CH₂CN, —CH₂CH₂CH₂CN—CONH₂

otherwise, R is selected from nitrile, acetonitrile, ethylnitrile, propylnitrile, carboxyamide, amidine, pyrazole, oxime, hydrazone, acetamidine, acetamide, guanidine, and urea. In some embodiments, X is C₁ to C₄ haloalkyl, and in some embodiments, X is CF₃. In some embodiments, R is aminoacetamide or guanidine. Formula II also includes pharmaceutically acceptable salts thereof, metabolism products, and prodrugs thereof

Another embodiment described herein is that of formula III:

wherein R is selected from the group consisting of —CN, —CH₂CN, —CH₂CH₂CN, —CH₂CH₂CH₂CN—CONH₂

otherwise, R is selected from nitrile, acetonitrile, ethylnitrile, propylnitrile, carboxyamide, amidine, pyrazole, oxime, hydrazone, acetamidine, acetamide, guanidine, and urea. In some embodiments, R is aminoacetamide or guanidine. Formula II also includes pharmaceutically acceptable salts thereof, metabolism products, and prodrugs thereof

Some additional compounds of formula III include the following groups for R:

In another embodiment, the compounds are that of formula IV or V:

Provided also are methods of using the compounds of formulae I-V to induce apoptosis in the undesirable proliferating cells in subjects in need of such treatment. The method involves treating the subject in need of such treatment with a therapeutically effective amount of a compound of formulae I-V or derivative, metabolites, or pharmaceutically acceptable salts thereof.

The compounds and methods described herein are useful for, but not limited to treating, inhibiting, or delaying the onset of cancers. The compounds and methods are also useful in the treatment of precancers and other incidents of undesirable cell proliferation. The compounds of formula I, II, III, IV or V, or combinations thereof, are administered to a subject that has been diagnosed with or is at risk of developing a disorder characterized by undesirable cell proliferation. The compounds and methods are useful for treating cancers including, but not limited to, leukemia, melanoma, non-small cell lung cancer, colon cancer, cancers of the central nervous system, ovarian cancer, breast cancer, kidney cancer, and prostate cancer. Furthermore, they are useful in the slowing the growth of these cancers in individuals with precancers, as well as individuals prone to or having a genetic predisposition to these disorders.

The compounds are useful in methods of inducing apoptosis in unwanted rapidly proliferating cells, the method comprising introducing a therapeutically effective amount of a compound of formula I, II, III, IV, or V to the unwanted rapidly proliferating cells. In accordance with this method, the unwanted rapidly proliferating cells may be cancer cells. The cancer cells may be selected from the group consisting of leukemia, melanoma, non-small cell lung cancer, colon cancer, cancers of the central nervous system, ovarian cancer, breast cancer, kidney cancer, and prostate cancer.

The compounds are further useful for preventing restenosis in a subject who has undergone an angioplasty or stent procedure comprising administering a therapeutically effective amount of a compound of formula I, II, III, IV, or V, or combinations thereof, or pharmaceutically acceptable salts and/or metabolites thereof to the subject who has undergone an angioplasty or stent procedure.

The following terms used herein include, but are not limited to the following definitions.

The term “PDK-1/Akt signaling inhibitor” signifies that a specific compound or combination of compounds is capable of disrupting the PDK-1/Akt signaling pathway, as measured versus a blank, regardless of whether in vivo or in vitro. One method is set forth in the examples below, though other methods now known or later developed may also be used.

The term “treatment” as used herein, encompasses the administration and/or application of one or more compounds described herein, to a subject, for the purpose of providing prevention of or management of, and/or remedy for a condition. “Treatment” for the purposes of this disclosure, may, but does not have to, provide a cure; rather, “treatment” may be in the form of management of the condition. When the compounds described herein are used to treat unwanted proliferating cells, including cancers, “treatment” includes partial or total destruction of the undesirable proliferating cells with minimal destructive effects on normal cells. A desired mechanism of treatment of unwanted rapidly proliferating cells, including cancer cells, at the cellular level is apoptosis.

The term “prevention” as used herein includes either preventing or slowing the onset of a clinically evident unwanted cell proliferation altogether or preventing or slowing the onset of a preclinically evident stage of unwanted rapid cell proliferation in individuals at risk. Also intended to be encompassed by this definition is the prevention or slowing of metastasis of malignant cells or to arrest or reverse the progression of malignant cells. This includes prophylactic treatment of those at risk of developing precancers and cancers. Also encompassed by this definition is the prevention or slowing of restenosis in subjects that have undergone angioplasty or a stent procedure.

The terms “therapeutically effective” and “pharmacologically effective” are intended to qualify the amount of each agent which will achieve the goal of improvement in disease severity and the frequency of incidence over treatment with the compounds described herein. Therapeutically effective or pharmacologically effective amounts may readily be determined by those skilled in the art.

The term “subject” for purposes of treatment includes any human or animal subject who has been diagnosed with, has symptoms of, or is at risk of developing a disorder characterized by unwanted, rapid cell proliferation. Such disorders include, but are not limited to cancers and precancers. For methods of prevention the subject is any human or animal subject. To illustrate, for purposes of prevention, a subject may be a human subject who is at risk of or is genetically predisposed to obtaining a disorder characterized by unwanted, rapid cell proliferation, such as cancer. The subject may be at risk due to exposure to carcinogenic agents, being genetically predisposed to disorders characterized by unwanted, rapid cell proliferation, and so on. Besides being useful for human treatment, the compounds described herein are also useful for veterinary treatment of mammals, including companion animals and farm animals, such as, but not limited to dogs, cats, horses, cows, sheep, and pigs.

Dosage and Administration

Preliminary animal studies have shown that these compounds can be orally absorbed, can generate average serum concentrations several-fold higher than TGI, and more importantly, incur little toxicity to the animals after daily oral administration for one month (data not shown)

The compounds of the present invention can be formulated into suitable pharmaceutical preparations such as tablets, capsules, or elixirs for oral administration or in sterile solutions or suspensions for parenteral administration. The therapeutic agents described herein can be formulated into pharmaceutical compositions using techniques and procedures well known in the art.

The PDK-1/Akt signaling inhibitor described herein is compounded with a physiologically acceptable vehicle, carrier, excipient, binder, preservative, stabilizer, flavor, etc., in a unit dosage form as called for by accepted pharmaceutical practice. The amount of active substance in those compositions or preparations is such that a suitable dosage in the range indicated is obtained. In some embodiments, the dosage may be between 0.1 to 1000 mg of the PDK-1/Aft signaling inhibitor. In some embodiments, the compositions can be formulated in a unit dosage form, each dosage containing from 1 to 500 mg. In other embodiments, the dosage may be from 10 to 100 mg of the active ingredient. The term “unit dosage from” refers to physically discrete units suitable as unitary dosages for human subjects and other mammals, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect, in association with a suitable pharmaceutical excipient. The dosage may depend on many factors, such as the age and size of the subject, the condition being treated, the severity of the condition, and other factors known to those skilled in the art. Taking those factors into account, dosages can be determined by those skilled in the art.

To prepare compositions, one or more of the therapeutic agents employed in the methods of the invention are mixed with a suitable pharmaceutically acceptable carrier. Upon mixing or addition of the therapeutic agent(s), the resulting mixture may be a solution, suspension, emulsion, or the like. These may be prepared according to methods known to those skilled in the art. The form of the resulting mixture depends upon a number of factors, including the intended mode of administration and the solubility of the compound in the selected carrier or vehicle. The effective concentration is sufficient for inducing apoptosis in undesired cells, such as cancer cells, and may be empirically determined.

Pharmaceutical carriers or vehicles suitable for administration of the present therapeutic agents include any such carriers suitable for the particular mode of administration. In addition, the active materials can also be mixed with other active materials that do not impair the desired action, or with materials that supplement the desired action, or have another action. The present therapeutic agents may be formulated as the sole pharmaceutically active ingredient in the composition or may be combined with other active ingredients. Derivatives of the present therapeutic agents, such as salts or prodrugs, may also be used in formulating effective pharmaceutical compositions.

The present therapeutic agents may be prepared with carriers that protect them against rapid elimination from the body, such as time-release formulations or coatings. Such carriers include controlled release formulations, such as, but not limited to, microencapsulated delivery systems. The active compound can be included in the pharmaceutically acceptable carrier in an amount sufficient to exert a therapeutically useful effect in the absence of undesirable side effects on the patient treated.

The active ingredient may be administered at once, or may be divided into a number of smaller doses to be administered at intervals of time. It is understood that the precise dosage and duration of treatment is a function of the disease being treated and may be determined empirically using known testing protocols or by extrapolation from in vivo or in vitro test data. It is to be noted that concentrations and dosage values may also vary with the severity of the condition to be alleviated. It is to be further understood that for any particular subject, specific dosage regimens should be adjusted over time according to the individual need and the professional judgment of the person administering or supervising the administration of the compositions, and that the concentration ranges set forth herein are exemplary only and are not intended to limit the scope or practice of the claimed compositions.

Oral compositions will generally include an inert diluent or an edible carrier and may be compressed into tablets or enclosed in gelatin capsules. For the purpose of oral therapeutic administration, the active compound or compounds can be incorporated with excipients and used in the form of tablets, capsules, or troches. Pharmaceutically compatible binding agents and adjuvant materials can be included as part of the composition.

The tablets, pills, capsules, troches, and the like can contain any of the following ingredients or compounds of a similar nature: a binder such as, but not limited to, gum tragacanth, acacia, corn starch, or gelatin; an excipient such as microcrystalline cellulose, starch, or lactose; a disintegrating agent such as, but not limited to, alginic acid and corn starch; a lubricant such as, but not limited to, magnesium stearate; a glidant, such as, but not limited to, colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; and a flavoring agent such as peppermint, methyl salicylate, or fruit flavoring.

The compounds of formulae I-V may trigger cell death by a number of different mechanisms, however, in most embodiments, the compounds of formulae I-V are able to induce apoptosis in unwanted, proliferative cells. The term “apoptosis” refers to the process of programmed cell death. In every person hundreds of thousands of old or damaged cells die each day by the process of apoptosis and are replaced in the ebb and flow of maintaining a constant number of living cells in the body. Old and damaged cells die in response to a signal triggered on the cell surface for the targeted cell to self destruct. Apoptosis is distinguished from other mechanisms of cell death, such as necrosis, which results in inflammation including swelling, redness, pain and tenderness. Apoptosis does not stimulate such reactions. In apoptosis, the cells shrivel up, break into pieces and the contents are quietly removed by methods that do not induce inflammation. For these reasons, it is highly desirable to induce apoptosis, rather than necrosis, in rapidly proliferating cells, such as cancer cells. However, mutations in some cancer cells confer resistance of these cells to apoptosis. The compounds of formulae I-V have been found to induce apoptosis even in cancer cells which, because of mutations, are otherwise resistant to apoptosis. Apoptosis can be distinguished from other treatment mechanisms by methods such as microscopy, which are known in the art.

The terms “proliferative cells,” “proliferating cells,” “rapidly proliferating cells,” “undesirable proliferating cells,” “undesirable rapidly proliferating cells,” “unwanted rapidly proliferating cells,” and the like, refer to cancer cells, precancer cells, and other unwanted, rapidly dividing cells in a subject.

Materials and Methods

Materials 4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide was extracted from capsules obtained from Amerisource Health (Malvern, Pa.) with ethyl acetate followed by recrystallization from a mixture of ethyl acetate and hexane. The Cell Death Detection ELISA kit was purchased from Roche Diagnostics (Mannheim, Germany). Rabbit polyclonal antibodies against Akt and phospho-⁴⁷³ Ser Akt were obtained from Cell Signaling Technologies (Beverly, Mass.). Mouse monoclonal anti-poly(ADPribose) polymerase (PARP) antibody was provided by Pharmingen (Sari Diego, Calif.). The PDK-1 kinase assay kit was purchased from Upstate (Lake Placid, N.Y.). Other chemical and biochemicals were obtained from Sigma-Aldrich (St. Louis, Mo.) unless otherwise mentioned. Nuclear magnetic resonance spectra (¹H NMR) were measured on Bruker 250 MHz. Chemical shifts (δ) are reported in parts per million (ppm) relative to TMS peak with CDCl₃ as solvent unless otherwise mentioned. High-resolution electrospray ionization mass spectrometry analyses were performed with a 3-Tesla Finnigan FTMS-2000 Fourier Transform mass spectrometer.

Synthesis of Chemicals

The compounds listed in Table 1 were prepared and tested as indicated below. The chemical names, proton nuclear magnetic resonance (¹H NMR) and high-resolution mass spectrometry (HRMS) data are summarized below. The procedures used to synthesize compounds 1-36 are described in the Examples, below.

TABLE 1 Nomenclatures, 1H NMR (proton nuclear magnetic resonance), and HRMS (high resolution mass spectrometry) characterizations of compounds 1-36. Compound Description 1 4-[5-(4-(2-bromoethyl)phenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide ¹H-NMR δ3.16 (t, J = 6.4, 2.0 Hz, 2H), .3.60 (t, J = 6.4, 2.0 Hz, 2H), 4.90 (s, 2H), 6.75 (s, 1H), 7.13 (d, J = 8.0 Hz, 2H), 7.20 (d, J = 8.0 Hz, 2H), 7.47 (d, J = 8.5 Hz, 2H), 7.91 (d, J = 8.5 Hz, 2H) C₁₈H₁₅BrF₃N₃O₂S: HRMS (M + Na⁺): theoretical mass, 495.9913; actual mass, 495.9943 2 4-[5-(4-(3-bromopropyl)phenyl)-3-(trifluoromethvl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 2.16 (m, 2H), 2.81 (t, J = 7.1 Hz, 2H), 3.41 (t, J = 6.4 Hz, 2H), .5.08 (s, 2H), 6.76 (s, 1H), 7.15 (d, J = 8.2 Hz, 2H), 7.25 (d, J = 8.2 Hz, 2H), 7.47 (d, J = 8.5 Hz, 2H), 7.90 (d, J = 8.5 Hz, 2H) C₁₉H₁₇BrF₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 510.0069; actual mass, 510.0042 3 4-[5-(4-(2-azidoethyl)phenyl)-3-(trifluoromethvl)-1H-pyrazol-1-yl]benzenesulfonamide ¹H-NMR δ 2.90 (t, J = 6.8 Hz, 2H), 3.51 (t, J = 6.8 Hz, 2H), .5.49 (s, 2H), 6.76 (s, 1H), 7.17 (d, J = 8.3 Hz, 2H), 7.24 (d, J = 8.3 Hz, 2H), 7.42 (d, J = 8.7 Hz, 2H), 7.85 (d, J = 8.7, 2.0 Hz, 2H) C₁₈H₁₅F₃N₆O₂S; HRMS (M + Na⁺): theoretical mass, 459.0821; actual mass, 459.0817 4 4-[5-(4-(3-azidopropyl)phenyl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 1.83 (m, 2H), 2.64 (t, J = 7.5 Hz, 2H), 3.20 (t, J = 7.5 Hz, 2H), .5.31 (br s, 2H), 6.67 (s, 1H), 7.07 (m, 4H), 7.35 (dd, J = 7.5, 2.0 Hz, 2H), 7.79 (d, J = 7.5, 2.0 Hz, 2H) C₁₉H₁₇F₃N₆O₂S; HRMS (M + Na⁺): theoretical mass, 473.0978; actual mass, 473.0946 5 4-[5-(4-butylphenyl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 0.93 (t, J = 7.2 Hz, 3H), 1.36 (m, 2H), 1.64 (m, 2H), 2.63 (t, J = 7.6 Hz, 2H), 5.54 *sm 2H), 6.76 (s, 1H), 7.15 (d, J = 8.3 Hz, 2H), 7.20 (d, J = 8.3 Hz, 2H), 7.45 (dt, J = 8.8, 2.0 Hz, 2H), 7.88 (dt, J = 8.8, 2.0 Hz, 2H) C₂₀H₂₀F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 446.1120; actual mass, 446.1149 6 4-[5-(4-t-butylphenyl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 1.33 (s, 9H), 4.90 (s, 2H), 6.53 (s, 1H), 7.32 (dd, J = 9.7 Hz, 4H), 7.42 (d, J = 8.8 Hz, 2H), 8.02 (d, J = 8.8 Hz, 2H) C₂₀H₂₀F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 446.1120; actual mass, 446.1118 7 4-[5-(2-naphthalenyl)-3-(trifluoromethvl)-1H-pyrazol-l-yl]benzenesulfonamide 1H-NMR δ 5.47 (s, 2H), 6.89 (s, 1H), 7.18 (dd, J = 8.6, 1.6 Hz, 1H), 7.42 (bd, J = 8.6 Hz, 2H), 7.51-7.55 (m, 2H), 7.78-7.83 (m, 6H) C₂₀H₁₄F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 440.0651; actual mass, 440.0657 8 4-[5-(3-indolyl)-3(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ (acetone-d₆)6.69 (br s, 1H), 7.03-7.08 (m, 2H), 7.19 (t, J = 7.2 Hz, 1H), 7.40 (d, J = 7.8 Hz, 1H), 7.50 (d, J = 7.8 Hz, 1H), 7.67 (d, J = 8.7 Hz, 2H), 7.92 (d, J = 8.7 Hz, 2H) C₁₈H₁₃F₃N₄O₂S; HRMS (M + Na⁺): theoretical mass, 429.0603; actual mass, 429.0606 9 4-[5-4-biphenylyl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzensulfonamide ¹H-NMR δ 4.81 (s, 2H), 6.75 (s, 1H), 7.23 (d, J = 8.5 Hz, 2H), 7.34-7.56 (m, 5H), 7.56 (m, 4H), 7.86 (d, J = 8.5 Hz, 2H) C₂₂H₁₆F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 466.0807; actual mass, 466.0811 10 4-[5-(4′-chloro[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 6.42 (s, 2H), 6.83 (s, 1H), 7.30 (d, J = 8.2 Hz, 2H), 7.40-7.59 (m, 8H), 7.92 (d, J = 8.2 Hz, 2H) C₂₂H₁₅ClF₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 500.0418; actual mass, 500.0432 11 4-[5-(3′,5′-dichloro[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 4.85 (s, 2H), 6.82 (s, 1H), 7.30 (d, J = 8.8 Hz, 2H), 7.36 (s, 1H), 7.37-7.57 (m, 6H), 7.93 (d, J = 8.8 Hz, 2H) C₂₂H₁₄Cl₂F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 534.0028; actual mass, 534.0016 12 4-[5-(2′,3′-dichloro[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 4.85 (s, 2H), 6.76 (s, 1H), 7.18-7.25 (m, 3H), 7.35-7.49 (m, 6H), 7.88 (d, J = 8.6 Hz, 2H) C₂₂H₁₄Cl₂F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 534.0028; actual mass, 533.9999 13 4-[5-(2′,4′,5′-trichloro[1,1′-biphenyl]-4-yl)-3 (trifluoromethyl)-1H-pyrazol-l-yl]benzenesulfonamide ¹H-NMR δ 4.86 (s, 2H), 6.77 (s, 1H), 7.25 (dt, J = 8.6, 2.0 Hz, 2H), 7.37 (dt, J = 8.6, s.0 Hz, 2H), 7.39 (s, 1H), 7.46 (dt, J = 8.8, 2.0 Hz, 2H), 7.54 (s, 1H), 7.88 (dt, J = 8.9, 1.2 Hz, 2H) C₂₂H₁₃Cl₃F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 567.9638; actual mass, 567.9679 14 4-[5-(4′-methyl[1,1′-biphenyl]4-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 2.32 (s, 3H), 4.57 (s, 2H), 6.72 (s, 1H), 7.18-7.21 (m, 4H), 7.39-7.52 (m, 6H), 7.84 (d, J = 8.9 Hz, 2H) C₂₃H₁₈F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 480.0964; actual mass, 480.0961 15 4-[5-(4′triflouromethyl[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 5.19 (s, 2H), 6.86 (s, 1H), 7.36 (d, J = 8.0 Hz, 2H), 7.53 (d, J = 8.5 Hz, 2H), 7.65 (m, 6H), 7.92 (d, J = 8.5 Hz, 2H) C₂₃H₁₅F₆N₃O₂S; HRMS (M + Na⁺): theoretical mass, 534.0681; actual mass, 534.0677 16 4-[5-(4′-bromomethyl[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 3.92 (s, 2H), 4.93 (s, 2H), 6.66 (s, 1H), 7.03-7.26 (m, 8H), 7.38 (d, J = 8.6 Hz, 2H), 7.82 (d, J = 8.6 Hz, 2H) C₂₃H₁₇BrF₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 558.0069; actual mass, 558.0112 17 4-[5-(3′,5′-dimethyl[1,1;-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 2.40 (s, 6H), 5.38 (br s, 2H), 6.83 (s, 1H), 7.05 (s, 1H), 7.25 (m, 4H), 7.50 (dd, J = 6.7, 1.7 Hz, 2H), 7.59 (dd, J = 6.7, 1.7 Hz, 2H), 7.92 (dd, J = 6.7, 1.7 Hz, 2H) C₂₄H₂₀F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 494.1120; actual mass, 494.1119 18 4-[5-(4′-butyl[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 0.96 (t, J = 7.5 Hz, 3H), 1.41 (m, 2H), 1.66 9m, wH), 2.68 (t, J = 7.5 Hz, 2H), 5.20 (br s, 2H), 6.84 (s, 1H), 7.29 (dd, J = 8.2, 2.0 Hz, 4H), 7.53 (dt, J = 8.2, 2.0 Hz, 4H), 7.62 (d, J = 8.5 Hz, 2H), 7.93 (d, J = 8.5 Hz, 2H) C₂₆H₂₄F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 522.1433; actual mass, 522.1466 19 4-[5-(4′-tert-buty[1,1′-biphenyl]-4-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 1.35 (s, 9H), 4.87 (s, 2H), 6.59 (s, 1H), 7.44-7.57 (m, 6H), 7.58 (d, J = 7.5 Hz, 2H), 7.92 (d, J = 8.7 Hz, 2H), 8.12 (d, J = 7.5 Hz, 2H) C₂₆H₂₄F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 522.1433; actual mass, 522.1401 20 4-[5-(4-(phenylmethyl)phenyl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 3.71 (s, 2H), 4.74 (s, 2H), 6.52 (s, 1H), 6.91-7.11 (m, 9H), 7.27 (d, J = 8.9 Hz, 2H), 7.69 (d, J = 8.9 Hz, 2H) C₂₃H₁₈F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 480.0964; actual mass, 580.0938 21 4-[5-(9H-fluoren-2-yl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 3.88 (s, 2H), 4.64 (s, 2H), 6.68 (s, 1H), 7.26-7.38 (m, 4H), 7.56 (d, J = 8.7 Hz, 2H), 7.74-7.81 (m, 3H), 7.90 (d, J = 8.7 Hz, 2H) C₂₃H₁₆F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 478.0807; actual mass, 478.0771 22 4-[5-(9-anthracenyl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 4.63 (s, 2H), 6.93 (s, 1H), 7.33 (d, J = 6.8 Hz, 2H), 7.45-7.55 (m, 8H), 8.04 (d, J = 6.8 Hz, 2H), 8.60 (s, 1H) C₂₄H₁₆F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 490.0807; actual mass 490.0769 23 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ (600 MHz) 4.89 (s, 2H), 6.92 (s, 1H), 7.37 (d, J = 8.5, 1.4 Hz, 1H), 7.51 (d, J = 8.6 Hz, 2H), 7.54-7.69 (m, 3H), 7.80 (d, J = 8.8 Hz, 1H), 7.86-7.92 (m, 4H), 8.64 (d, J = 8.4 Hz, 2H) C₂₄H₁₆F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 490.0807; actual mass, 490.0805 24 4-[5-(9-phenanthrenyl)-3-(trifluoromethyl)-1H-1-yl]benzenesulfonamide ¹H-NMR δ 4.76 (s, 2H), 6.90 (s, 1H), 7.43-7.84 (m, 11H), 8.72 (t, J = 7.8 Hz, 2H) C₂₄H₁₆F₃N₃O₂S; HRMS (M + Na⁺): theoretical mass, 490.0807; actual mass, 490.0833 25 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-yl]benzenecarboxamide ¹H-NMR δ 5.75-6.05 (br d, 2H), 7.0 (s, 1H), 7.50 (dd, J = 8.5, 1.4 Hz, 1H), 7.55 (d, J = 8.5 Hz, 2H), 7.77 (m, 3H), 7.88 (m, 3H), 7.90 (m, 2H), 8.72 (m, 2H) C₂₅H₁₆F₃N₃O; HRMS (M + Na⁺): theoretical mass, 454.0038; actual mass, 454.1142 26 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-yl]benzonitrile ¹H-NMR δ 6.91 (s, 1H), 7.46 (s, 1H), 7.50 (d, J = 2.0 Hz, 2H), 7.63-7.79 (m, 5H), 7.83 (d, J = 2.0 Hz, 2H), 7.92 (m, 1H), 8.64 (d, J = 8.4 Hz, 2H) C₂₅H₁₄F₃N₃O; HRMS (M + Na⁺): theoretical mass, 436.1032; actual mass, 436.1032 27 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-yl]-N-hydroxy-benzmidine ¹H-NMR δ 7.10 (s, 1H), 7.34 (dd, J = 4.0, 0.9 Hz, 1H), 7.36 (d, J = 0.9 Hz, 1H), 7.37 (d, J = 0.9 Hz, 1H), 7.42-7.45 (m, 3H), 7.46 (d, J = 0.8 Hz, 1H), 7.51-7.52 (m, 2H), 7.53 (d, J = 0.9 Hz, 1H), 7.57 (s, 1H), 7.89 (s, 1H), 7.91 (s, 1H) C₂₅H₁₇F₃N₃O; HRMS (M + Na⁺): theoretical mass, 469.1220; actual mass, 469.1247 28 5-(2-phenanthrenyl)-3-(trifluoromethyl)-4-(1H-1-tetrazol-5-ylphenyl)-1H-pyrazole ¹H-NMR δ 6.82 (s, 1H), 7.28 (d, J = 1.8 Hz, 1H), 7.38 (d, J = 8.7 Hz, 2H), 7.48-7.74 (m, 5H), 7.74 (d, J = 2.5 Hz, 2H), 7.95 (d, J = 8.7 Hz, 2H), 8.47 (d, J = 8.7 Hz, 2H) C₂₅H₁₅F₃N₆; HRMS (M + Na⁺): theoretical mass, 479.1202; actual mass, 479.1225 29 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-pyrazol-1-yl]-benzaldehyde oxime ¹H-NMR δ 6.81 (s, 1H), 7.27-7.30 (m, 3H), 7.47 (d, J = 8.7 Hz, 2H), 7.52-7.57 (m, 4H), 76.8 (d, J = 8.8 Hz, 2H), 7.75-7.79 (m, 2H), 8.48-8.53 (m, 2H) C₂₅H₁₆F₃N₃O; HRMS (M + Na⁺): theoretical mass, 454.1137; actual mass, 454.1106 30 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-pyrazol-1-yl]-benzaldehyde hydrazone ¹H-NMR δ 6.81 (s, 1H), 7.27-7.30 (m, 2H), 7.33 (d, J = 1.8 Hz, 1H), 7.42 (d, J = 8.6 Hz, 1H), 7.53-7.55 (m, 2H), 7.57-7.60 (m, 2H), 7.68 (d, J = 8.9 Hz, 2H), 7.75 (d, J = 1.7 Hz, 1H), 7.80 (s, 1H), 8.48-8.55 (m, 2H) C₂₅H₁₇F₃N₄; HRMS (M + Na⁺): theoretical mass, 453.1297; actual mass, 453.1302 31 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-pyrazol-1-yl]-phyenyl}-acetonitrile ¹H-NMR δ 3.77 (S, 2h), 6.93 (S, 1h), 7.29-7.43 (M, 4h), 7.66-7.86 (M, 6h), 8.65 (T, J = 7.0 Hz, 3H) C₂₆H₁₆F₃N₃; HRMS (M + Na⁺): theoretical mass, 450.1151; actual mass, 450.1188 32 2-{4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-1-pyrazol-1-yl]-phenyl}-N-hydroxy-acetamidine ¹H-NMR δ 3.30 (s, 1H), 3.38 (s, 1H), 6.83 (s, 1H), 7.20-7.41 (m, 4H), 7.59-7.89 (m, 6H), 8.55-8.60 (m, 3H) C₂₆H₁₉F₃N₄O; HRMS (M + Na⁺): theoretical mass, 461.1580; actual mass, 461.1584 33 5-(2-phenanthrenyl)-3-(trifluoromethyl)-4-(1H-tetrazol-5-ylmethylphenyl)-1H-pyrazole ¹H-NMR δ 4.45 (s, 2H), 7.15 (s, 1H), 7.42 (s, 4H), 7.53 (d, J = 6.9 Hz, 1H), 7.66-7.76 (m, 3H), 7.89 (d, J = 7.2 Hz, 1H), 8.01 (m, 2H), 8.78 (t, J = 6.9 Hz, 2H) C₂₆H₁₇F₃N₆; HRMS (M + Na⁺): theoretical mass, 493.1335; actual mass, 493.1359 34 2-amino-N-{4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl}acetamide ¹H-NMR δ 3.48 (s, 2H), 6.92 (s, 1H), 7.35 (d, J = 8.8 Hz, 2H), 7.42 (dd, J = 8.6, 1.7 Hz, 1H), 7.62-7.72 (m, 5H), 7.79 (d, J = 8.8 Hz, 1H), 7.85-7.94 (m, 2H), 8.62 (t, J = 8.5 Hz, 2H), 9.56 (br s 1H) C₂₆H₁₉F₃N₄O; HRMS (M + Na⁺): theoretical mass, 483.1403; actual mass, 483.1389 35 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl-guanidine ¹H-NMR δ 6.90 (s, 1H), 7.19 (d, J = 8.7 Hz, 2H), 7.34 (dd, J = 8.7, 2.0 Hz, 1H), 7.39 (d, J = 8.7 Hz, 2H), 7.61-7.67 (m, 3H), 7.79 (d, J = 9.0 Hz, 1H), 7.84-7.91 (m, 3H), 8.62 (d, J = 8.3 Hz, 2H), 9.95 (s, 1H) C₂₅H₁₈F₃N₅; HRMS (M + H): theoretical mass, 446.1587 (M + H); actual mass, 446.1596 (M + H) 36 4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl-urea ¹H-NMR δ 6.98 (s, 1H), 7.19 (dt, J = 8.9, 2.1 Hz, 2H), 7.34-7.42 (m, 3H), 7.51-7.62 (m, 4H), 7.70 (d, J = 9.0 Hz, 1H), 7.81-7.85 (m, 2H), 8.59-8.64 (m, 2H) C₂₅H₁₇F₃N₄O; HRMS (M + Na⁺): theoretical mass, 469.1252; actual mass, 469.1199

Cell Culture PC-3 (p53−/−) human androgen-nonresponsive prostate cancer cells were purchased from the American Type Tissue Collection (Manassas, Va.). Cells were cultured in RPMI 1640 medium (Gibco, Grand Island, N.Y.) supplemented with 10% fetal bovine serum (FBS; Gibco) at 37° C. in a humidified incubator containing 5% CO₂.

Cell viability analysis The effect of 4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide and its derivatives on PC-3 cell viability was assessed by using the MTT {[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide]} assay in six replicates. Cells were grown in 10% FBS-supplemented RPMI 1640 medium in 96-well, flat bottomed plates for 24 h, and were exposed to various concentrations of compounds 1-36 dissolved in DMSO (final concentration≦0.1%) in 1% serum-containing RPMI 1640 medium for different time intervals. Controls received DMSO vehicle at a concentration equal to that in drug-treated cells. The medium was removed, replaced by 200 μl of 0.5 mg/ml of MTT in 10% FBS-containing RPMI-1640 medium, and cells were incubated in the CO₂ incubator at 37° C. for 2 h. Supernatants were removed from the wells, and the reduced MTT dye was solubilized in 200 μL/well DMSO. Absorbance at 570 nm was determined on a plate reader.

Cell proliferation PC-3 cells were seeded into six-well plates at 50,000 cells/well in 10% FBS-containing RPMI 1640 medium. Following a 24 h attachment period, cells were treated in triplicate with the indicated concentration of compounds 1-36 or DMSO vehicle in 10% FBS-containing RPMI-1640 medium. At different time intervals, cells were harvested by trypsinization, and numerated using a Coulter counter model Z1 D/T (Beckman Coulter, Fullerton, Calif.).

Apoptosis analysis Two methods were used to assess drug-induced apoptotic cell death: detection of DNA fragmentation by the Cell Death Detection ELISA kit (Roche Diagnostics. Mannheim, Germany) and Western blot analysis of poly-(ADP-ribose)polymerase (PARP) cleavage. The ELISA was performed according to the manufacturer's instructions, and is based on the quantitative determination of cytoplasmic histone-associated DNA fragments in the form of mononucleosomes or oligonucleosomes generated after induced apoptotic death. In brief, 4×10⁵ PC-3 cells were cultured in a T-25 flask for 24 h before treatment. Cells were treated with the DMSO vehicle or the test agent at the indicated concentrations for 6-24 h, collected, and cell lysates equivalent to 2×10³ PC-3 cells were used in the ELISA. For the PARP cleavage assay, drug-treated cells were collected 4-8 h post-treatment, washed with ice-cold PBS, and resuspended in lysis buffer containing 20 mM Tris-HCl, pH 8, 137 mM NaCl, 1 mM CaCl₂, 10% glycerol, 1% Nonidet P-40, 0.5% deoxycholate, 0.1% SDS, 100 μM 4-(2-aminoethyl)benzenesulfonyl fluoride, leupeptin at 10 μg/mL, and aprotinin at 10 μg/mL. Soluble cell lysates were collected after centrifugation at 10,000 g for 5 min. Equivalent amounts of proteins (60-100 μg) from each lysate were resolved in 8% SDS-polyacrylamide gels. Bands were transferred to nitrocellulose membranes, and analyzed by immunoblotting with anti-PARP antibody.

Immunoblotting. The general procedure for the Western blot analysis of Akt and phospho-Akt is described as follows. Cells were washed in PBS, resuspended in SDS sample buffer sonicated by an ultrasonic sonicator for 5 sec, and boiled for 5 min. After brief centrifugation, equivalent protein concentrations from the soluble fractions were resolved in 10% SDS-polyacrylamide gels on a Minigel apparatus, and transferred to a nitrocellulose membrane using a semi-dry transfer cell. The transblotted membrane was washed three times with TBS containing 0.05% Tween 20 (TBST). After blocking with TBST containing 5% nonfat milk for 60 min., the membrane was incubated with the primary antibody at 1:1,000 dilution in TBST-5% low fat milk at 4° C. for 12 h, and was then washed three times with TBST. The membrane was probed with goat anti-rabbit IgG-HRP conjugates (1:1,000) for 1 h at room temperature, and was washed with TBST three times. The immunoblots were visualized by enhanced chemiluminescence.

PDK-1 kinase activity This in vitro assay was performed using a PDK-1 kinase assay kit (Upstate, Lake Placid, N.Y.) according to the vendor's instructions. This cell-free assay is based on the ability of recombinant PDK-1, in the presence of DMSO vehicle or the test agent, to activate its downstream kinase serum- and glucocorticoid-regulated kinase (SGK.) which, in turn, phosphorylates the Akt/SGK-specific peptide substrate RPRAATF with [γ-³²]-ATP. The [³²P]-phosphorylated peptide substrate was then separated from the residual [γ-³²P]-ATP using P81 phosphocellulose paper and quantitated by a scintillation counter after three washes with 0.75% phosphoric acid. The reported values represent the means of two independent determinations.

Immunoprecipitated Akt kinase assay Akt immunoprecipitation was carried out according to a modified, published procedure. PC-3 cells were treated with DMSO vehicle or the test agents at the indicated concentrations for 2 h and then lysed at 4° C. for 1 h in buffer A containing 50 mM Tris-HCl, pH 7.5, 1% Triton X-100, 1 mM EDTA, 1 mM EGTA, 50 mM sodium fluoride, 10 mM sodium β-glycerophosphate. 0.1% 2-mercaptoethanol, 0.1 mM phenylmethylsiilfonyl fluoride, and 1 μg/mL each of aprotinin, pepstatin, and leupeptin. Cell lysates were centrifuged at 10,000 g for 5 min, and the supernatant was treated with anti-Akt at 4° C. for 60 min., followed by protein G-agarose beads for additional 60 min. The immunoprecipitate was used to analyze Akt kinase activity by using the Akt/SGK-specific peptide substrate RPRAATF as described above. Values represented the means of two independent determinations.

Statistical analysis Each experiment was performed in triplicate, unless otherwise mentioned. All experiments were carried out at least two times on different occasions. Where appropriate, the data are presented as the mean±95% confidence interval.

The structure and potency in inhibiting PDK-1 kinase activity and PC-3 cell growth of 24 representative derivatives are summarized in Table 2.

TABLE 2 Structures and potency for inhibiting recombinant PDK-1 kinase activity and for inducing apoptotic death in PC-3 cells for 4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1- yl] benzenesulfonamide and compounds 37-60 (1-24)

IC₅₀ (μM) Number Ar PDK-1 PC-3 Com- parative Com- pound

48 30 37

42 18 38

38 17 39

32 17 40

34 18 41

20 9 42

34 18 43

24 11 44

65 31 45

21 11 46

22 9 47

18 10 48

23 10 49

9 5 50

15 8 51

18 8 52

20 11 53

17 9 54

32 15 55

32 15 56

15 8 57

16 9 58

12 7 59

9 5 60

42 23

These compounds, except the indole derivative 44, showed improved PDK-1 inhibitory and anti-proliferative activities vis-à-vis 4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide. Additionally, none of these compounds displayed measurable COX-2 inhibitory activity (data not shown). A general increase in PDK-1 inhibitory activity was noted with increasing bulkiness of the aromatic ring, i.e., tricyclic aromatic rings (57-59)>substituted biphenyl (45-55)>substituted phenyl (37-42). These data suggested that the aromatic system bound to a large, hydrophobic region of the enzyme pocket. Among the 24 analogues examined, compound 59 represented the optimal derivative with IC₅₀ values of 9 μM and 5 μM for inhibiting PDK-1 activity and PC-3 cell viability, respectively, as reported in Table 2. These IC₅₀ values corresponded to a five- to six-fold improvement over the activities of 4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide (48 μM and 30 μM, respectively). However, compound 60 exhibited a decrease, compared with compound 59 in PDK-1 inhibitory activity, which might be attributable to steric hindrance imposed by an unfavorable orientation of the tricyclic aromatic ring.

There existed a correlation between PDK-1 and PC-3 growth inhibition potency in all compounds examined, suggesting the mechanistic relevance of PDK-1 inhibition to the antiproliferative effect. Overall, the IC₅₀ value for inhibiting PC-3 cell proliferation was approximately one half of that of PDK-1 inhibition. This discrepancy might arise from a mechanistic synergy between PDK-1 inhibition and concomitant Akt dephosphorylation by protein phosphatase 2A (PP2A) in Aug-treated cells, resulting in augmented Akt deactivation. To examine this premise, PC-3 cells were treated with different concentrations of compound 59 for 2 h, and the consequent effect on AM was assessed by two independent assays: immunoprecipitated Akt kinase activity and Akt phosphorylation status. Both assays gave consistent results.

According to the kinase assay, the IC₅₀ of compound 59 for inhibiting intracellular Akt activation was 5 μM. Neither compound 59 nor other the other compounds displayed a direct inhibitory effect on immunoprecipitated Akt activity. Meanwhile, Western blot analysis shows that treatment of PC-3 cells with compound 59 at 5 μM and above led to significant Akt dephosphorylation.

The inhibition of PDK-1/Akt signaling led to apoptotic death in PC-3 cells in 1% FBS-containing RPMI 1640 medium in a dose-dependent manner, as was evidenced by DNA fragmentation and PARP cleavage. The dose of compound 59 required to induce 50% PC-3 cell death at 24 h was 5 μM. The IC₅₀ values for compound 59 to induce PC-3 cell death was consistent with that of inhibiting Akt activation in drug-treated cells. Furthermore, the effect of compound 59 on PC-3 cell proliferation was examined in 10% FBS-supplemented RPMI 1640 medium. Compound 59 at 1 μM showed substantial anti-proliferative activity. Together, these data clearly indicated the in vitro efficacy of compound 59 in PC-3 growth inhibition.

The modeling showed that compound 59 was docked into the ATP-binding domain that is located within a deep cleft between the two lobes of PDK-1. Although compound 59 competed with ATP for binding, the mode of binding for compound 59 was found to be somewhat different from that of ATP. While the benzenesulfonamide moiety occupied the adenine-binding motif, the planar pyrazole moiety was perpendicular to the ribose ring. This arrangement positioned the adjacent phenanthrene ring behind the trisphosphate-binding pocket. The phenanthrene ring formed hydrophobic interactions with an apolar region formed by residues 88-96 encompassing part of two adjacent β sheets joined by a glycine-rich loop.

Structures of twelve representative derivatives, their potency against PDK-1, and their ability to cause apoptotic death in PC-3 cells are summarized in Table 3.

TABLE 3 Structures and potency for inhibiting recombinant PDK-1 kinase activity and for inducing apoptotic death in PC-3 cells for compounds 25-36. The general structures of these compounds is shown at top.

IC₅₀ (μM) Number R PDK-1 PC-3 61 —CONH₂ 12 7 62 —CN 45 30 63

40 25 64

52 32 65

25 14 66

16 10 67 —CH₂CN 42 25 68

15 8 69

45 27 70

5 5 71

2 3 72

40 24

Among these derivatives, compound 70 and 71 exhibited IC₅₀ values for PDK-1 inhibition of 5 μM and 2 μM, respectively, which represented two- and five-fold increases in potency over compound 59. Compounds 70 and 71 contained side chains of 2-aminoacetamide (—NHC(O)CH₂NH₂,) and guanidine (—NHC(═NH)NH₂), respectively. Like compound 59, they exhibited no appreciable direct inhibition on immunoprecipitated Akt kinase activity, nor was any measurable COX-2 inhibitory activity detected at concentrations up to 50 μM. Exposure of PC-3 cells to either agent, even at 1 μM, resulted in a substantial decrease in the phospho-Akt level. This improvement in potency reflected a strengthening of the hydrogen bonding in the protein-ligand interactions for these derivatives. This premise was supported by the modeled docking of compound 71 into the ATP-binding site. The guanidino group of compound 71 resembled the partial structure of ATP's purine ring, which allowed the formation of hydrogen bonds with Ser160 and Ala162 as depicted by the docking model.

Cellular effects of PDK-1/Akt signaling inhibitors Both compounds 70 and 71 induced apoptotic death in PC-3 cells in 1% FBS-containing medium in a dose-dependent manner, as was demonstrated by DNA fragmentation and PARP cleavage. These agents exhibited higher potency than compound 59 in apoptosis induction at concentrations greater than 2.5 μM. Moreover, these derivatives were submitted to the Developmental Therapeutic Program (DTP) at the National Cancer Institute (NCI) for screening against sixty human tumor cell lines, representing leukemia, melanoma, and cancers of the lung, colon, brain, ovary, breast, prostate, and kidney. Dose-response data of one representative cell line from each class of tumor cells after two-day exposure in 5% FBS-containing medium are shown in FIG. 1C, which include: 1, RPMI-8226 leukemia cells; 2, NCI-H322M non-small cell lung cancer cells; 3, HT29 colon cancer cells; 4, U251 CNS cancer cells; 5, SK-MEL-28 melanoma cancer cells; 6, SK-OV-3 ovarian cancer cells; 7, RXF 393 renal cancer cells; 8, PC-3 prostate cancer cells; 9, MDA-MB-231 breast cancer cells. Many of these cell lines were responsive to the growth inhibitory effect of both agents at concentrations as low as 0.1 μM

In the sixty cell line assay, three dose response parameters for each cell line were calculated based on growth inhibition curves. These parameters include G150 (concentration resulting in 50% growth inhibition), TGI (concentration resulting in tool growth inhibition), and LC50 (concentration resulting in a 50% reduction in the measured protein level at the end of drug treatment as compared to that at the beginning). The means of these parameters among the sixty different cell lines for compounds 70 and 71 after two-day treatment were as follows, respectively, G150: 1.1 and 1.2 μM; TGI: 3.2 and 2.9 μM; LC50: 24 and 8.5 μM. These data clearly demonstrate the in vitro efficacy of compounds 70 and 71. Both agents were able to completely suppress cell growth in a diverse range of tumor cell lines at the 3-5 μM therapeutic range.

In light of the conserved role of PDK-1/Akt signaling in cancer cell survival and proliferation, this pathway represents a therapeutically relevant target for developing orally bioavailable, small-molecule inhibitors.

In silico docking of compound 59 into the ATP-binding pocket showed that the molecule was anchored into the ATP binding domain, in part, through hydrogen bonding between the sulfonamide and the amide of Ala162. Ala162 has also been reported to play a key role in anchoring other ligands such as ATP¹⁷ and UCN-01 to PDK-1. Together, these data suggest that the sulfonamide moiety of compound 59 might be amenable to alterations for optimizing potency.

Accordingly, replacement of the sulfonamide function with 2-aminoacetamide (—NHC(O)CH₂NH₂) and guanidine [—NHC(═NH)NH₂] led to compounds 70 and 71, respectively, both of which exhibited improved PDK-1 inhibition with IC₅₀ values of 5 and 2 μM, respectively. Docking of compound 71 into the ATP binding site revealed the existence of an additional hydrogen bond between the guanidine moiety and the backbone-oxygen of Ser160, suggesting that the enhancement in potency might be attributable to an increase in hydrogen bonding. The effect of these side chains on ligand binding, however, is subtle, as illustrated by the structure-activity relationship summarized in Table 3.

The high potency of compounds 70 and 71 in PDK-1 inhibition was reflected in their abilities to effectively block Akt activation and to induce apoptotic cell death in PC-3 cells at low μM concentrations (FIG. 1A, B). More importantly, due to the conserved role of PDK-1/Akt signaling in cell proliferation and survival, these agents were potent in inhibiting cell growth in serum-containing medium in all 60 human tumor cell lines examined, with mean GI50 (50% cell growth inhibition) values of 1.2 μM and 1.3 μM, respectively, arid TGI (total growth inhibition) values of 3.2 μM and 2.9 μM, respectively. Our preliminary animal studies have shown that these compounds can be orally absorbed, can generate average serum concentrations several-fold higher than TGI, and more importantly, incur little toxicity to the animals after daily oral administration for one month (data not shown).

Testing of in vivo efficacy against different tumor xenoarafts in nude mice is currently under way in this laboratory. In addition, toxicological and pharmacological testing of these agents will be undertaken under the Rapid Access to Intervention Development (RAID) program at NCI.

General Synthetic Procedures for Compounds 37-60

All chemical reagent and organic solvents were purchased from Aldrich (St. Louis, Mo.) unless otherwise mentioned. Compounds 1-24 were synthesized according to a two-step general procedure described in Scheme 1, in which Ar represents the respective aromatic ring structures.

Compound 59 is used here as an example to illustrate the synthesis of the group of compounds (Scheme 2). Other compounds followed the same procedures via precursors and the respective intermediates with different aromatic ring structures (compounds I and II).

EXAMPLE 1

Synthesis of the 1,1,1-Trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one Precursor (step 1). To a suspension of sodium hydride (NaH; 0.13 g, 5.4 mmol) in 5 mL of anhydrous tetrahydrofuran (THF) was added ethyl trifluoracetate (CF₃COOEt; 0.64 g, 4.5 mmol) under argon. After stirring at 25° C. for 10 minutes, 2-acetylphenanthrene (1 g, 4.5 mmol) in 5 mL of THF was added dropwise to the solution. The mixture became clear and orange-hued within 30 minutes, and after stirring for an additional 2 hours, was concentrated under vacuum. The residue was suspended in water, and extracted with ethyl acetate (15 mL) twice. The organic phase was separated, dried over sodium sulfate, and concentrated to dryness under vacuum to give the product (yellow solid; 1.29 g, 90% yield). The product was used directly without further purification.

EXAMPLE 2

Synthesis of Compound 59 (step 2). 4-Hydrazinobenzene-1-sulfonamide hydrochloride (1.1 g; 4.9 mmol) was added to a stirred solution of 1,1,1,-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one (1.29 g, 4.1 mmol) in 40 mL of ethanol. The mixture was refluxed for 12 hours, cooled to room temperature, and concentrated to dryness under vacuum. The residue was dissolved in ethyl acetate, and washed with water. The organic layer was dried over sodium sulfate, and concentrated under vacuum. The crude product was purified by silica gel flash chromatography to yield 59 (1.52 g, 80% yield).

EXAMPLES 3-14

Syntheses of Compounds 61-72 Compounds 61-72 were synthesized using 1,1,1-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one, product of the aforementioned step 1, as a common precursor (Scheme 3, FIG. 2.)

EXAMPLE 3

4-[5-(2-Phenanthracenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-benzenecarboxamide (61) (step 3). (4-Carbamoylphenyl)-hydrazine hydrochloride (0.92 g, 4.9 mmol) was added to a stirred solution of 1,1,1-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one (1.29 g, 4.1 mmol) in 40 mL of ethanol at 25° C. The mixture was refluxed for 12 hours, cooled to room temperature and concentrated to dryness under vacuum. The residue was dissolved in ethyl acetate, and washed with water. The organic layer was dried over sodium sulfate, and concentrated under vacuum. The crude product was purified by silica gel flash chromatography (ethyl acetate-hexane, 1:1),—yielding 61 (1 g, 60% yield).

EXAMPLE 4

4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-benzonitrile (62) (step 4). To a stirred solution of 1,1,1-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one (2.45 g, 7.7 mmol) in 60 mL of ethanol was added 4-cyanophenylhydrazine hydrochloride (2.53 g, 15 mmol) at 25° C. The mixture was stirred under reflux for 12 hours, cooled to room temperature and concentrated to dryness under vacuum. The residue was dissolved in methylene chloride, and washed with water. The organic layer was dried over sodium sulfate, and concentrated under vacuum. The crude product was purified by silica gel flash chromatography (ethyl-acetate-hexane, 1:4) to afford 62 (2.7 g, 85% yield).

EXAMPLE 5

4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-N-hydroxybenzamidine (63) (step 5). Hydroxylamine hydrochloride (25 mg, 0.36 mmol) was added to a suspension of Na metal (8.3 mg, 0.36 mmol) in methanol (3 mL). The mixture was stirred at room temperature for 10 minutes. and compound 62 (1224 mg, 0.3 mmol) was added. The mixture was refluxed for 2 hours, then stirred at 25° C. for an additional 16 hours, and concentrated under vacuum. The residue was purified by silica gel flash chromatography (ethyl acetate-hexane, 1:4 to 1:1) to give 63 (120 mg, 76% yield).

EXAMPLE 6

5-(2-Phenanthrenyl)-3-(trifluoromethyl)-4-(1H-tetrazol-5-ylphenyl)-1H-pyrazole (64) (step 6). A mixture containing compound 62 (125 mg, 0.3 mmol), NH₄Cl (123.7 mg), and NaN₃ (58.5 mg, 0.9 mmol) in 5 mL of 10% HCl was added, and extracted with 20 mL of methylene chloride, twice. The organic phase was dried over sodium sulfate, and concentrated to dryness under vacuum. The crude product was purified by silica gel flash chromatography (ethyl acetate-hexane 1:4) to give 64 (96 mg, 70% yield).

EXAMPLE 7

4-5[-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyraxol-1-yl]-benzaldehyde oxime (65) (step 7). DIBAL-H (3.1 mL, 3.1 mmol, 1.0 M in hexane) was added dropwise to a solution of compound 62 (0.417 g, 1.1 mmol) in 5 mL THF at −40° C. The mixture was stirred for 8 hours, poured into 5 mL of 10% acetic acid, and stirred for 30 minutes. The organic layer was dried over sodium sulfate, and concentrated to dryness under vacuum. The crude product was purified by silica gel flash chromatography (ethyl acetate-hexane, 1:4) to give an aldehyde intermediate (141 mg, 0.34 mmol) that was immediately added to a solution containing hydroxylamide hydrochloride (211 mg) and K₂CO₃ in 5 mL of ethanol. The mixture was stirred under reflux for 16 hours. After removal of solvent, the residue was extracted with CH₂Cl₂ and washed with water.

EXAMPLE 8

4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-benzaldehyde hydrazone (66) (step 8). Compound 66 (124 mg, 85% yield) was synthesized in the same manner as 65 except that hydrazine monohydrate (153 mg, 3.1 mmol) was used instead of hydroxylamine hydrochloride.

EXAMPLE 9

{4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl}-acetonitrile (67) (step 9). (a) Preparation of (4-Hydrazinophenyl)acetonitrile hydrochloride. A solution of sodium nitrite (3.15 g, 45.7 mmol) in water (20 mL) was added dropwise to a cooled (−15° C.), stirred suspension of 4-aminobenzonitrile (5 g, 42.3 mmol) in a concentrated hydrogen chloride solution (55 mL) at such a rate as to maintain a temperature below −10° C. After the addition was finished, the reaction mixture was quickly filtered to remove solids, and the filtrate was added in portions to a cooled (−20° C.), stirred solution of SnCl₂.2H₂O (47.7 g, 0.21 mol) in a concentrated hydrogen chloride solution (37 mL) at such a rate as to keep the temperature below −10° C. After stirring the solution for an additional 15 minutes, the solid was collected, washed with diethyl ether (4×25 mL), and dried to give (4-hydrazinophenyl)acetonitrile hydrochloride (5.6 g, 78%). (b) Compound 67. A mixture of (4-hydrazinophenyl)acetonitrile hydrochloride (0.32 g, 1 mmol) and 1,1,1-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one (0.18 g, 1.1 mmol) in ethanol (20 mL) was stirred under reflux for 24 hours, cooled to room temperature, concentrated to dryness under vacuum, and dissolved in ethyl acetate. The organic layer was dried over magnesium sulfate, and concentrated to dryness under vacuum. The crude product was purified by silica gel column chromatography (hexane-ethyl acetate, 2:1) to give compound 67 (0.35 g, 81% yield).

EXAMPLE 10

2-{4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl}-N-hydroxy-acetamidine (68) (step 10). A solution of compound 67 (0.43 g, 1 mmol) and hydroxyamine hydrochloride (0.075 g, 1.1 mmol) in ethanol (10 mL) was stirred under reflux for 8 hours, and concentrated to dryness under vacuum. The residue was dissolved in water, brought to pH 8-9 by addition of saturated NaHCO₃ solution, and extracted with ethyl acetate. The organic layer was dried over magnesium sulfate, and concentrated to dryness under vacuum. The crude product was recrystallized in diethyl ether-hexane to give compound 68 (0.32 g, 71% yield).

EXAMPLE 11

5-(2-Phenanthrenyl)-3-(trifluoromethyl)-4-(1H-tetrazol-5-ylmethylphenyl)-1H-pyrazole (69) (step 11). A mixture containing compound 67 (0.43 g, 1 mmol), sodium azide (0.08 g, 1.2 mmol), and triethylamine hydrochloride (0.12 g, 1.2 mmol) in toluene (5 mL) was stirred at 100 C for 5 hours, cooled to room temperature, and extracted with water (10 mL). To the aqueous phase was added dropwise a 36% hydrogen chloride solution to salt out the resulting tetrazole 69. After filtration, the solid was dried under vacuum, yielding compound 33 (0.39 g, 84% yield).

EXAMPLES 12-14

1-(4-Nitrophenyl)-5-phenyl-3-(trifluoromethyl)-1H-pyrazole (III) (step 12). To a solution of 1,1,1-trifluoro-4-hydroxy-4-phenanthren-2-yl-but-3-en-2-one (1.29 g, 4.1 mmol) in 40 mL of ethanol was added 4-nitrophenylhydrazine hydrochloride (0.93 g, 4.9 mmol) under stirring, refluxed for 1 hour, cooled to room temperature, and concentrated to dryness under vacuum. The residue was dissolved in ethyl acetate, and washed with water. The organic phase was dried over magnesium sulfate, and concentrated to dryness under vacuum. The crude product was purified by silica gel column chromatography to afford compound III (0.88 g, 50% yield).

4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrozol-1-yl]phenylamine (IV) (step 13). To a solution of compound III (0.88 g, 2 mmol) in 20 mL ethanol was added platinum oxide (27 mg, 0.12 mmol), stirred under H₂ at 55 psi for 12 hours, filtered to remove the catalyst, and concentrated to dryness under vacuum. The crude product was purified by silica gel chromatography to yield compound IV (0.57 g, 70% yield).

EXAMPLE 12

2-Amino-N-{4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl}-acetamide (70) (steps 14 and 15). To a solution of t-butyloxycarbonyl (tBOC)-glycine (0.25 g, 1.4 mmol) and compound IV (0.57 g, 1.4 mmol) in 10 mL of tetrahydrofuran was added 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (0.41 g, 2.1 mmol), stirred at 25° C. for 12 hours, and concentrated to dryness under vacuum in a rotary evaporator. The residue was suspended in water, and the product was extracted with ethyl acetate. The organic phase was dried over magnesium sulfate, and concentrated to dryness under vacuum to give compound V (0.67 g, 85% yield). Compound V (0.67 g, 1.2 mmol) was dissolved in 8 mL of ethyl acetate containing 0.7 mL of concentrated HCl solution, stirred at room temperature for 2 hours, and concentrated to dryness under vacuum. The crude product was purified by silica gel column chromatography to yield compound 70 as a white powder (0.49 g, 90%).

EXAMPLE 13

4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]-phenyl-guanidine (71) (step 16). To a solution of compound IV (0.57 g, 1.4 mmol) in 7 mL of ethanol was added cyanamide (89 mg, 2.1 mmol) and 1.5 mL of 1N HCl. The mixture was refluxed for 24 hours, and concentrated to dryness under vacuum. The product was purified by silica gel column chromatography to give compound 71 as a white solid (0.25 g, 40% yield).

EXAMPLE 14

4-[5-(2-Phenanthrenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]phenyl urea (72) (step 17). Into a 250 mL round bottom flask containing acetic acid (50 mL), water (12 mL), and ethanol (20 mL) was added compound IV (2.25 g, 5.6 mmol), followed by sodium isocyanate (0.74 g, 11.2 mmol). The reaction was stirred for 1.5 hours, and then neutralized with the addition of 1 N sodium hydroxide followed by sodium hydroxide pellets until the pH had changed to 7.0. The product was separated and then washed with 100 mL of water, dried with magnesium sulfate, and then solvent was removed to obtain the crude product. Purification was performed by silica gel chromatography with (hexane-ethyl acetate, 3:2 to hexane-acetone, 1:3) to afford compound 72.

EXAMPLE 15

Preparation of Additional Compounds The compounds in Table 4 were prepared using the methods of the Examples above.

TABLE 4

Additional Compounds Com- pound R Nomenclature 73

4-(5-Phenanthren-2-yl-3- trifluoromethyl-pyrazol-1-yl)- N-(4-sulfamoyl-phenyl)- benzamide 74

N-[4-(5-Phenanthren-2-yl- 3-trifluoromethyl-pyrazol-1- yl)-phenyl]-4-sulfamoyl- benzamide 75

2-Guanidino-N-[4-(5- phenanthren-2-yl-3-trifluoro- methyl-pyrazol-1-yl)- phenyl]-acetamide 76

2-[4-(5-Phenanthren-2-yl-3- trifluoromethyl-pyrazol-1-yl)- phenylamino]-acetamide 77

N-{[4-(5-Phenanthren-2-yl-3- trifluoromethyl-pyrazol-1-yl)- phenylcarbamoyl]-methyl}- benzamide

EXAMPLE 16

Screening of compounds 70 and 71 against several cancer cell lines The human tumor cell lines of the cancer screening panel are grown in RPMI 1640 medium containing 5% fetal bovine serum and 2 mM L-glutamine. For a typical screening experiment, cells are inoculated into 96 well microtiter plates in 100 μL at plating densities ranging from 5,000 to 40,000 cells/well depending on the doubling time of individual cell lines. After cell inoculation, the microtiter plates are incubated at 37° C., 5% CO₂, 95% air and 100% relative humidity for 24 h prior to addition of experimental drugs.

After 24 h, two plates of each cell line are fixed in situ with TCA, to represent a measurement of the cell population for each cell line at the time of drug addition (Tz). Experimental drugs are solubilized in dimethyl sulfoxide at 400-fold the desired final maximum test concentration and stored frozen prior to use. At the time of drug addition, an aliquot of frozen concentrate is thawed and diluted to twice the desired final maximum test concentration with complete medium containing 50 μg/ml gentamicin. Additional four, 10-fold or ½ log serial dilutions are made to provide a total of five drug concentrations plus control. Aliquots of 100 μl of these different drug dilutions are added to the appropriate microtiter wells already containing 100 μl of medium, resulting in the required final drug concentrations.

Following drug addition, the plates are incubated for an additional 48 h at 37° C., 5% CO₂, 95% air, and 100% relative humidity. For adherent cells, the assay is terminated by the addition of cold TCA. Cells are fixed in situ by the gentle addition of 50 μl of cold 50% (w/v) TCA (final concentration, 10% TCA) and incubated for 60 minutes at 4° C. The supernatant is discarded, and the plates are washed five times with tap water and air dried. Sulforhodamine B (SRB) solution (100 μl) at 0.4% (w/v) in 1% acetic acid is added to each well, and plates are incubated for 10 minutes at room temperature. After staining, unbound dye is removed by washing five times with 1% acetic acid and the plates are air dried. Bound stain is subsequently solubilized with 10 mM trizma base, and the absorbance is read on an automated plate reader at a wavelength of 515 nm. For suspension cells, the methodology is the same except that the assay is terminated by fixing settled cells at the bottom of the wells by gently adding 50 μl of 80% TCA (final concentration, 16% TCA). Using the seven absorbance measurements [time zero, (Tz), control growth, (C), and test growth in the presence of drug at the five concentration levels (Ti)], the percentage growth is calculated at each of the drug concentrations levels. Percentage growth inhibition is calculated as: [(Ti−Tz)/(C−Tz)]×100 for concentrations for which Ti>/=Tz [(Ti−Tz)/Tz]×100 for concentrations for which Ti<Tz

Three dose response parameters are calculated for each experimental agent. Growth inhibition of 50% (GI₅₀) is calculated from [(Ti−Tz)/(C−Tz)]×100=50, which is the drug concentration resulting in a 50% reduction in the net protein increase (as measured by SRB staining) in control cells during the drug incubation. The drug concentration resulting in total growth inhibition (TGI) is calculated from Ti=Tz. The LC₅₀ (concentration of drug resulting in a 50% reduction in the measured protein at the end of the drug treatment as compared to that at the beginning) indicating a net loss of cells following treatment is calculated from [(Ti−Tz)/Tz]×100=−50. Values are calculated for each of these three parameters if the level of activity is reached; however, if the effect is not reached or is exceeded, the value for that parameter is expressed as greater or less than the maximum or minimum concentration tested.

The methods described were used to test compounds 70 and 71 on a panel of sixty cell lines under a screening service provided by the Developmental Therapeutics Program at the National Institutes of Health. Shown in FIG. 1C are 1, RPMI-8226 leukemia cells; 2; NCI-H322M non-small cell lung cancer cells; 3, HT29 colon cancer cells; 4, U251 CNS cancer cells; 5, SK-MEL-28 melanoma cancer cells; 6, SK-OV-3 ovarian cancer cells; 7, RXF 393 renal cancer cells; 8, PC-3 prostate cancer cells; 9, MDA-MB-231 breast cancer cells.

Results of testing compounds 70 and 71 against the full 60 cell lines are shown in the tables below. The testing was done by the National Cancer Institute Developmental Therapeutics Program. The results shown are in vitro testing results.

TABLE 5 Results of testing Compound 70 against 60 cancer cell lines Log10 Concentration Panel/Cell Time Mean Optical Densities Percent Growth Line Zero Ctrl −8.0 −7.0 −6.0 −5.0 −4.0 −8.0 −7.0 −6.0 −5.0 −4.0 GI50 TGI LC50 Leukemia CCRF-CEM 0.295 1.099 0.893 0.946 0.523 0.168 0.194 74 81 28 −43 −34 3.87E−07 2.49E−06 >1.00E−04  K-562 0.297 1.467 1.435 1.022 0.681 0.209 0.247 97 62 33 −30 −17 2.57E−07 3.34E−06 >1.00E−04  MOLT-4 0.313 1.048 0.964 0.951 0.614 0.180 0.296 89 87 41 −42 −6 6.36E−07 3.10E−06 >1.00E−04  RPMI-8226 0.332 0.845 0.766 0.701 0.547 0.164 0.229 85 72 42 −51 −31 5.37E−07 2.84E−06 . SR 0.364 0.902 0.816 0.796 0.605 0.265 0.363 84 80 45 −27 — 7.11E−07 4.17E−06 >1.00E−04  Non-Small Cell Lung Cancer A549/ATCC 0.363 1.279 1.294 1.149 0.831 0.155 0.252 102 86 51 −57 −31 1.02E−06 2.96E−06 . EKVX 0.557 0.860 0.891 0.860 0.786 0.156 0.193 110 100 75 −72 −65 1.49E−06 3.25E−06 7.08E−06 HOP-62 0.510 1.395 1.310 1.330 1.075 0.155 0.217 90 93 64 −70 −57 1.27E−06 3.01E−06 7.13E−06 HOP-92 1.070 1.526 1.509 1.474 1.465 0.095 0.267 96 89 87 −91 −75 1.61E−06 3.07E−06 5.87E−06 NCI-H226 1.190 1.594 1.593 1.586 1.429 0.505 0.614 100 98 59 −58 −48 1.20E−06 3.21E−06 . NCI-H23 0.457 1.655 1.672 1.673 1.255 0.097 0.156 101 102 67 −79 −66 1.30E−06 2.87E−06 6.33E−06 NCI-H322M 0.626 2.465 1.363 1.562 1.420 0.100 0.269 40 51 43 −84 −57 . 2.18E−06 5.40E−06 NCI-H460 0.319 1.843 1.799 1.499 0.830 0.173 0.213 97 77 34 −46 −33 4.21E−07 2.64E−06 >1.00E−04  NCI-H522 0.766 1.549 1.626 1.718 1.528 0.260 0.486 110 122 97 −66 −37 1.95E−06 3.94E−06 . Colon Cancer COLO 205 0.221 1.412 1.286 1.252 0.916 0.104 0.239 89 87 58 −53 1 1.19E−06 . . HCT-116 0.114 0.708 0.751 0.665 0.452 0.104 0.146 107 93 57 −9 5 1.27E−06 . >1.00E−04  HCT-15 0.279 0.875 0.760 0.599 0.561 0.149 0.278 81 54 47 −47 . 3.65E−07 3.19E−06 >1.00E−04  HT29 0.215 1.453 1.355 1.299 0.801 0.075 0.159 92 88 47 −65 −26 8.58E−07 2.64E−06 . KM12 0.535 2.184 2.151 2.044 1.425 0.146 0.264 98 91 54 −73 −51 1.07E−06 2.67E−06 6.62E−06 SW-620 0.187 1.202 1.197 1.198 0.736 0.127 0.136 100 100 54 −32 −28 1.12E−06 4.23E−06 >1.00E−04  CNS Cancer SF-268 0.376 1.142 1.016 0.930 0.789 0.252 0.280 84 72 54 −33 26 1.11E−06 4.16E−06 >1.00E−04  SF-295 0.421 1.224 1.173 1.190 0.915 0.225 0.287 94 96 62 −47 −32 1.28E−06 3.71E−06 >1.00E−04  SNB-19 0.532 1.721 1.562 1.655 1.230 0.219 0.324 87 94 59 −59 −39 1.18E−06 3.15E−06 . U251 0.391 1.301 1.298 1.139 0.810 0.144 0.320 100 82 46 −63 −18 7.75E−07 2.64E−06 . Melanoma LOX IMVI 0.353 1.166 1.204 0.974 0.742 0.176 0.352 105 76 48 −50 . 8.36E−07 3.07E−06 . MALME- 0.666 1.165 1.123 1.128 1.102 0.218 0.290 92 93 87 −67 −56 1.74E−06 3.67E−06 7.73E−06 3M M14 0.315 0.986 0.975 0.974 0.916 0.211 0.256 98 98 90 −33 −19 2.10E−06 5.37E−06 >1.00E−04  SK-MEL-2 0.456 0.883 0.943 0.956 0.885 0.289 0.330 114 117 100  −37 −28 2.33E−06 5.40E−06 >1.00E−04  SK-MEL-28 0.530 1.482 1.426 1.320 1.130 0.071 0.218 94 83 63 −87 −59 1.22E−06 2.64E−06 5.69E−06 SK-MEL-5 0.549 2.147 1.995 1.958 1.659 0.136 0.364 91 88 69 −75 −34 1.36E−06 3.02E−06 . UACC-62 0.675 1.600 1.649 1.546 1.407 0.137 0.364 105 94 79 −80 −46 1.53E−06 3.15E−06 . Ovarian Cancer IGROV1 0.462 1.060 1.044 1.103 0.902 0.235 0.302 97 107 74 −49 −35 1.56E−06 3.97E−06 >1.00E−04  OVCAR-3 0.460 0.929 0.879 0.849 0.816 0.140 0.301 89 83 76 −70 −35 1.51E−06 3.32E−06 . OVCAR-4 0.530 1.121 1.114 1.073 1.086 0.093 0.172 99 92 94 −82 −68 1.78E−06 3.41E−06 6.55E−06 OVCAR-5 0.512 1.507 1.480 1.540 1.412 0.087 0.149 97 103 90 −83 −71 1.71E−06 3.32E−06 6.45E−06 OVCAR-8 0.400 1.101 1.078 1.114 0.755 0.269 0.306 97 102 51 −33 −24 1.02E−06 4.05E−06 >1.00E−04  SK-OV-3 0.399 1.623 1.514 1.597 1.262 0.083 0.302 91 98 71 −79 −24 1.37E−06 2.96E−06 . Renal Cancer 786-0 0.652 1.958 2.012 1.897 1.440 0.181 0.299 104 95 60 −72 −54 1.20E−06 2.85E−06 6.79E−06 A498 0.945 2.261 2.230 2.598 2.201 0.660 0.433 98 126 95 −30 −54 2.30E−06 5.75E−06 6.69E−05 ACHN 0.374 1.026 0.985 1.037 0.829 0.150 0.313 94 102 70 −60 −16 1.42E−06 3.45E−06 . CAKI-1 0.597 1.862 1.692 1.802 1.126 0.147 0.335 87 95 42 −75 −44 7.03E−07 2.27E−06 . RXF 393 0.403 0.801 0.766 0.700 0.628 0.177 0.441 91 75 56 −56 10 1.14E−06 . . SN12C 0.584 1.233 1.209 1.194 1.093 0.203 0.308 96 94 78 −65 −47 1.58E−06 3.51E−06 . TK-10 0.672 1.496 1.512 1.492 1.304 0.138 0.200 102 100 77 −80 −70 1.48E−06 3.10E−06 6.47E−06 UO-31 0.443 1.782 1.572 1.563 1.356 0.161 0.285 84 84 68 −64 −36 1.37E−06 3.29E−06 . Prostate Cancer PC-3 0.242 0.996 0.910 0.763 0.593 0.055 0.108 89 69 47 −77 −55 7.05E−07 2.38E−06 6.02E−06 DU-145 0.327 0.961 0.993 1.018 0.895 0.078 0.132 105 109 90 −76 −60 1.73E−06 3.47E−06 6.95E−06 Breast Cancer MCF7 0.452 1.672 1.566 1.541 0.982 0.196 0.255 91 89 43 −57 −44 7.18E−07 2.72E−06 . NCI/ADR- 0.556 1.904 1.883 1.878 1.217 0.229 0.212 98 98 49 −59 −62 9.54E−07 2.85E−06 8.28E−06 RES MDA-MB- 0.642 0.988 0.988 0.889 0.843 0.173 0.306 100 71 58 −73 −52 1.15E−06 2.77E−06 6.67E−06 231/ ATCC HS 578T 0.534 1.186 1.221 1.179 1.110 0.351 0.333 105 99 88 −34 −38 2.05E−06 5.25E−06 >1.00E−04  MDA-MB- 0.404 1.469 1.502 1.447 1.126 0.127 0.347 103 98 68 −69 −14 1.35E−06 3.14E−06 . 435 BT-549 0.492 0.957 0.912 0.891 0.785 0.143 0.195 90 86 63 −71 −60 1.25E−06 2.95E−06 6.98E−06 T-47D 0.423 1.019 0.921 1.071 0.935 0.205 0.238 84 109 86 −52 −44 1.82E−06 4.21E−06 .

TABLE 6 Results of testing Compound 71 against 60 cancer cell lines Log10 Concentration Panel/Cell Time Mean Optical Densities Percent Growth Line Zero Ctrl −8.0 −7.0 −6.0 −5.0 −4.0 −8.0 −7.0 −6.0 −5.0 −4.0 GI50 TGI LC50 Leukemia CCRF-CEM 0.295 0.949 0.808 0.811 0.718 0.002 0.140 78 79 65 −99 −53 1.23E−06 2.48E−06 5.00E−06 K-562 0.297 1.401 1.338 1.283 0.438 0.126 0.119 94 89 13 −58 −60 3.26E−07 1.52E−06 7.77E−06 MOLT-4 0.313 0.957 0.833 0.736 0.461 0.143 0.143 81 66 23 −54 −54 2.33E−07 1.98E−06 8.75E−06 RPMI-8226 0.332 0.682 0.536 0.559 0.513 0.016 0.176 58 65 52 −95 −47 1.03E−06 2.25E−06 . SR 0.364 0.888 0.688 0.583 0.254 0.234 0.287 62 42 −30 −36 −21 3.86E−08 3.79E−07 >1.00E−04  Non-Small Cell Lung Cancer A549/ATCC 0.363 1.175 1.140 1.145 1.121 −0.032 0.135 96 96 93 −100 −63 1.68E−06 3.04E−06 5.51E−06 EKVX 0.557 0.841 0.713 0.737 0.711 −0.008 0.145 55 63 54 −100 −74 1.06E−06 2.24E−06 4.74E−06 HOP-62 0.510 1.288 1.285 1.267 1.255 0.011 0.329 100 97 96 −98 −36 1.72E−06 3.12E−06 . HOP-92 1.070 1.647 1.567 1.541 1.361 0.089 0.767 86 82 50 −92 −28 1.01E−06 2.26E−06 . NCI-H23 0.457 1.669 1.585 1.515 1.679 −0.041 0.151 93 87 101 −100 −67 1.79E−06 3.18E−06 5.64E−06 NCI-H322M 0.626 1.181 0.988 1.049 1.031 −0.052 0.257 65 76 73 −100 −59 1.36E−06 2.64E−06 5.14E−06 NCI-H460 0.319 1.792 1.654 1.658 1.650 0.011 0.257 91 91 90 −97 −20 1.64E−06 3.04E−06 . NCI-H522 0.766 1.671 1.509 1.558 1.471 0.037 0.439 82 87 78 −95 −43 1.45E−06 2.82E−06 . Colon Cancer COLO 205 0.221 1.196 1.146 1.028 0.930 0.009 0.151 95 83 73 −96 −32 1.36E−06 2.69E−06 . HCT-116 0.114 0.714 0.607 0.633 0.525 −0.022 0.058 82 86 68 −100 −49 1.29E−06 2.55E−06 . HCT-15 0.279 0.893 0.669 0.779 0.797 −0.003 0.082 64 81 84 −100 −71 1.54E−06 2.87E−06 5.36E−06 HT29 0.215 1.333 1.276 1.238 1.136 −0.054 0.003 95 91 82 −100 −99 1.50E−06 2.83E−06 5.32E−06 KM12 0.535 1.957 1.867 1.832 1.777 0.013 0.307 94 91 87 −98 −43 1.59E−06 2.97E−06 . SW-620 0.187 1.073 0.923 0.993 1.060 −0.048 0.015 83 91 98 −100 −92 1.75E−06 3.13E−06 5.60E−06 CNS Cancer SF-268 0.376 1.016 0.893 0.939 0.886 0.148 0.278 81 88 80 −61 −26 1.63E−06 3.69E−06 . SF-295 0.421 1.107 1.033 0.931 0.997 −0.025 0.195 89 74 84 −100 −54 1.53E−06 2.86E−06 5.35E−06 SNB-19 0.532 1.483 1.385 1.385 1.351 0.063 0.317 90 90 86 −88 −40 1.61E−06 3.12E−06 . U251 0.391 1.156 1.125 1.059 1.123 0.026 0.484 96 87 96 −93 12 1.74E−06 . . Melanoma LOX IMVI 0.353 1.164 0.948 1.033 0.935 0.008 0.165 73 84 72 −98 −53 1.34E−06 2.65E−06 5.22E−06 MALME-3M 0.666 0.984 0.832 0.838 0.826 0.089 0.333 52 54 50 −87 −50 1.01E−06 2.33E−06 1.00E−04 M14 0.315 0.935 0.772 0.823 0.816 −0.004 0.210 74 82 81 −100 −33 1.48E−06 2.80E−06 . SK-MEL-2 0.456 0.830 0.775 0.819 0.780 −0.010 0.324 85 97 87 −100 −29 1.57E−06 2.91E−06 . SK-MEL-28 0.530 1.508 1.439 1.408 1.367 −0.002 0.248 93 90 86 −100 −53 1.56E−06 2.89E−06 5.38E−06 SK-MEL-5 0.549 1.640 1.611 1.762 1.812 0.143 0.363 97 111 116 −74 −34 2.22E−06 4.07E−06 . UACC-62 0.675 1.477 1.323 1.338 1.301 −0.041 0.272 81 83 78 −100 −60 1.44E−06 2.74E−06 5.24E−06 Ovarian Cancer IGROV1 0.462 1.091 0.997 0.983 0.806 −0.039 0.216 85 83 55 −100 −53 1.07E−06 2.26E−06 4.75E−06 OVCAR-3 0.460 0.868 0.833 0.792 0.770 −0.043 0.131 91 81 76 −100 −72 1.40E−06 2.70E−06 5.20E−06 OVCAR-4 0.530 1.123 1.011 0.999 0.945 −0.001 0.179 81 79 70 −100 −66 1.31E−06 2.58E−06 5.08E−06 OVCAR-5 0.512 1.592 1.538 1.437 1.559 −0.033 0.474 95 86 97 −100 −8 1.73E−06 3.11E−06 . OVCAR 8 0.400 0.968 0.923 0.946 0.934 −0.001 0.126 92 96 94 −100 −69 1.69E−06 3.05E−06 5.52E−06 SK-OV-3 0.399 1.327 1.261 1.245 1.093 0.062 0.278 93 91 75 −85 −30 1.43E−06 2.94E−06 . Renal Cancer 786-0 0.652 1.912 1.862 1.868 1.663 0.046 0.458 96 96 80 −93 −30 1.49E−06 2.91E−06 . A498 0.945 2.207 2.413 2.087 1.869 1.903 0.540 116 91 73 76 −43 1.65E−05 4.35E−05 >1.00E−04  ACHN 0.374 1.026 0.898 0.902 0.964 0.034 0.291 80 81 90 −91 −22 1.67E−06 3.15E−06 . CAKI-1 0.597 1.767 1.735 1.642 1.804 −0.067 0.315 97 89 103 −100 −47 1.83E−06 3.22E−06 . RXF 383 0.403 0.829 0.582 0.629 0.629 0.156 0.385 42 53 53 −61 −4 . 2.91E−06 . SN12C 0.584 1.115 1.050 0.998 1.045 −0.014 0.224 88 78 87 −100 −62 1.57E−06 2.91E−06 5.40E−06 TK-10 0.672 1.134 1.032 1.087 0.998 −0.021 0.245 78 90 71 −100 −64 1.32E−06 2.59E−06 5.09E−06 UO-31 0.443 1.467 1.375 1.407 1.332 −0.030 0.288 91 94 87 −100 −35 1.57E−06 2.92E−06 . Prostate Cancer PC-3 0.242 1.068 0.862 0.846 0.857 −0.022 0.179 75 73 75 −100 −26 1.38E−06 2.67E−06 . DU-145 0.327 0.835 0.694 0.767 0.760 −0.074 −0.019 72 87 85 −100 −100 1.55E−06 2.89E−06 5.37E−06 Breast Cancer MCP7 0.452 1.540 1.467 1.340 1.507 0.073 0.229 93 82 97 −84 −49 1.82E−06 3.44E−06 . NCI/ADR-RES 0.556 1.942 1.920 1.882 1.874 0.490 0.294 98 96 95 −12 −47 2.64E−06 7.73E−06 >1.00E−04  MDA-MB-231/ 0.642 0.884 0.756 0.830 0.709 0.015 0.389 47 78 27 −98 −39 . 1.66E−06 . ATCC HS 578T 0.534 1.167 1.099 1.165 1.127 0.168 0.333 89 100 94 −69 −38 1.86E−06 3.78E−06 . MDA-MB-435 0.404 1.498 1.376 1.382 1.444 −0.073 0.295 89 89 95 −100 −27 1.70E−06 3.07E−06 . T-47D 0.423 0.750 0.541 0.578 0.529 0.100 0.198 36 47 32 −76 −53 <1.00E−08  1.98E−06 5.72E−06

The examples described herein are meant to be illustrative of the synthesis and applications of the compounds described. The examples are not meant to limit the scope of the invention described herein. 

The invention claimed is:
 1. A method of inducing apoptosis in unwanted rapidly proliferating cells, the method comprising the step of contacting a therapeutically effective amount of a compound of formula I:

wherein X is selected from the group consisting of alkyl and haloalkyl; Ar is selected from the group consisting of phenyl, biphenyl, naphthyl, anthryl, phenanthrenyl, and fluorenyl; wherein Ar is optionally substituted with one or more substituents at any suitable position; R is selected from the group consisting of —CN, —CH₂CN, —CH₂CH₂CN, —CH₂CH₂CH₂CN,

or pharmaceutically acceptable salts thereof, with the rapidly proliferating cells.
 2. The method of claim 1, wherein the rapidly proliferating cells are cancer cells, wherein the cancer is selected from the group consisting of leukemia, non-small cell lung cancer, colon cancer, central nervous system cancer, melanoma, ovarian cancer, renal cancer, prostate cancer, and breast cancer.
 3. The method of claim 1 wherein the compound is selected from compounds IV and V:

or a combination thereof, pharmaceutically acceptable salts thereof.
 4. The method of claim 1, wherein X is C₁ to C₄ haloalkyl.
 5. The method of claim 4, wherein X is CF₃.
 6. The method of claim 1, wherein Ar is selected from the group consisting of 2-naphthyl, 4-biphenyl, 9-anthryl, 2-fluorenyl, 4-azidophenyl, 4-azidomethylphenyl, 4-(2-azidoethyl)phenyl, 4-(3-azidopropyl)phenyl, 4-(4-azidobutyl)phenyl, 4-(4-azidophenyl)phenyl, 4-(4-azidomethylphenyl)phenyl, 4-methylphenyl, 4-ethylphenyl, 4-propylphenyl, 4-butylphenyl, 4-(2-bromoethyl)phenyl, 4-(3-bromopropyl)phenyl, 4-(4-bromobutyl)phenyl, 4-(trifluoromethyl)phenyl, 4-(4-methylphenyl)phenyl, 4-(4-bromomethylphenyl)phenyl, 4-(4-butylphenyl)phenyl, 4-(4-tert-butylphenyl)phenyl, 2-chlorophenyl, 4-chlorophenyl, 2,4-dichlorophenyl, 3,4-dichlorophenyl, 2,5-dichlorophenyl, 2,4-dimethylphenyl, 2,5-dimethylphenyl, 3,4-dimethylphenyl, 3,5-dimethylphenyl, 4-(4-chlorophenyl)phenyl, 4-(3,5-dichlorophenyl)phenyl, 4-(2,3-dichlorophenyl)phenyl, 4-(3,5-dimethylphenyl)phenyl, 4-(2,4,5-trichlorophenyl)phenyl, 4-(4-trifluoromethylphenyl)phenyl, 2-phenanthrenyl, 3-indolyl, 2-pyrrolyl, and 4-(benzyl)phenyl.
 7. The method of claim 6, wherein Ar is 2-phenanthrenyl.
 8. The method of claim 1, wherein R is selected from aminoacetamide and guanidine.
 9. The method of claim 1, wherein X is CF₃, Ar is 2-phenanthrenyl, and R is selected from aminoacetamide and guanidine.
 10. The method of claim 1, wherein the compound is:

or pharmaceutically acceptable salts thereof, and wherein the rapidly proliferating cells are cancer cells, wherein the cancer is selected from the group consisting of leukemia, non-small cell lung cancer, colon cancer, central nervous system cancer, melanoma, ovarian cancer, renal cancer, prostate cancer, and breast cancer. 